Aluminium Foils For Battery: High-Precision Core Components for New Energy Storage

Aluminium Foils For Battery are specialized high-purity aluminum products engineered as critical components for lithium-ion, sodium-ion, and solid-state batteries-serving dual roles as cathode current collectors and soft-pack packaging barriers. Tailored to meet the rigorous demands of new energy vehicles (NEVs), energy storage systems (ESS), and consumer electronics, these foils combine ultra-thin gauges, exceptional conductivity, and strict dimensional control to boost battery performance, safety, and lifespan. Available in core alloys (1060, 1100, 1235, 8021) and tempers (H18 for current collectors, O for packaging), they undergo precision rolling, cleaning, and optional coating processes (carbon, graphene) to optimize compatibility with battery electrolytes and active materials. Compliant with automotive and battery industry standards, our battery aluminium foils are trusted by global battery manufacturers for their consistency, reliability, and ability to support high-efficiency battery production.

The manufacturing of Aluminium Foils For Battery is a precision-driven process that leaves no room for defects-every parameter directly impacts battery performance. We start with high-purity aluminum ingots (99.6%+ purity) to ensure superior conductivity and chemical stability. For cathode current collector foils, alloys like 1060 and 1235 are rolled to ultra-thin gauges (0.009-0.025mm) in H18 temper, through multi-pass cold rolling with strict thickness control. The rolling process is optimized to achieve uniform grain structure, with over 80% of grains aligned in the (001) orientation to minimize resistance anisotropy and keep vertical-horizontal square resistance difference within 5%. For soft-pack packaging foils, 8021 alloy in O temper is used for its excellent cold-forming ability and barrier properties, rolled to 0.015-0.06mm with zero pinholes. Post-rolling, a critical cleaning process removes residual rolling oil to below 5mg/m² (detected via gas chromatography), ensuring strong adhesion of active materials. Optional conductive coatings (carbon, graphene, carbon nanotubes) are applied for enhanced performance, creating a stable interface between the foil and electrode materials.

Core Performance Traits of Aluminium Foils For Battery

Battery aluminium foils stand out for their targeted performance enhancements, each designed to address the unique challenges of battery operation. Key attributes include:

1. Superior Electrical Conductivity

High-purity alloys (1060, 1100) deliver excellent conductivity (≥55% IACS), with square resistance controlled below 0.1Ω/□. Every 0.01Ω reduction in square resistance boosts battery energy density by 0.5%, ensuring fast electron transfer across the cathode and minimizing internal resistance. This conductivity is maintained consistently across the entire foil surface, preventing local current concentration and reducing electrochemical polarization during charge-discharge cycles.

2. Strict Dimensional Uniformity & Thin Gauge Control

Ultra-thin gauges (0.009-0.06mm) are achieved with precise thickness tolerance (±5% for 0.01-0.02mm foils) and transverse thickness fluctuation ≤±0.5μm (CV value <1%). This uniformity is critical for consistent electrode coating-thickness variations can lead to uneven current distribution, internal short circuits, and reduced battery safety. Width tolerance is controlled to ±0.5mm (for widths ≤1000mm), supporting high-speed battery assembly lines.

3. Optimized Mechanical Properties

Temper-specific mechanical properties ensure compatibility with battery manufacturing processes. H18 temper current collector foils offer tensile strength of 190-280MPa (longitudinal ≥150MPa, transverse ≥130MPa) to resist breakage during slitting and electrode cutting. Elongation ≥2% prevents cracking during electrode winding and cell assembly. O temper packaging foils provide elongation ≥12% and cup convex value ≥7mm, enabling smooth cold forming into complex soft-pack shapes without tearing.

4. Excellent Chemical & Electrochemical Stability

The foils demonstrate exceptional resistance to battery electrolytes, with corrosion weight loss <0.5mg/cm² after 240 hours of immersion (per ASTM G67 standard). This stability prevents chemical reactions between the foil and electrolyte, avoiding degradation and extending battery cycle life. The natural oxide layer on the aluminum surface further enhances corrosion resistance, forming a protective barrier without compromising conductivity.

5. Controlled Surface Characteristics

Surface roughness is precisely controlled between 0.2-0.5μm-low enough to ensure uniform coating, yet sufficient to prevent active material delamination. Wetting tension (dyne value) is maintained ≥30mN/m (≥32mN/m for optimal performance), ensuring seamless spreading and adhesion of electrode slurries. Surface finishes include single-sided light (SSL), double-sided light (DSL), and conductive coatings, tailored to different electrode designs.

Product Specifications & Alloy Variants

We offer fully customized battery aluminium foils to match diverse battery types (lithium-ion, sodium-ion, solid-state) and applications (NEVs, ESS, consumer electronics). Key specifications are as follows:

1. Alloy & Temper Options

2. Key Technical Parameters

Mechanical Properties

Tensile Strength (H18): 190-280MPa

Tensile Strength (O): 80-100MPa

Elongation (H18): ≥2%

Elongation (O): ≥12%

Electrical & Surface Properties

Conductivity: ≥55% IACS

Square Resistance: <0.1Ω/□

Surface Roughness: 0.2-0.5μm

Dyne Value: ≥30mN/m

Dimension & Packaging

Width: 200-1840mm

Coil ID: 76.2/152.4mm

Coil OD: 800-1100mm

Rolling Oil Residue: <5mg/m²

Key Applications Across Battery Sectors

Battery aluminium foils are indispensable across the new energy ecosystem, supporting diverse battery types and end applications. Common use cases include:

1. New Energy Vehicle (NEV) Batteries

Our H18 temper 1060/1235 foils (0.012-0.016mm) serve as cathode current collectors for lithium-ion batteries in electric cars, buses, and trucks. Their high tensile strength resists high-speed slitting and winding, while uniform thickness ensures consistent electrode performance. For soft-pack NEV batteries, 8021 O temper foils provide superior oxygen and moisture barrier, preventing cell swelling and extending battery life under harsh driving conditions.

2. Energy Storage Systems (ESS)

Ideal for large-scale ESS (grid storage, commercial backup) using lithium-ion or sodium-ion batteries. Conductive coated foils (carbon/graphene) reduce interface resistance, improving charge-discharge efficiency and cycle life-critical for systems requiring thousands of cycles. The strict chemical stability ensures reliable performance in long-term stationary storage environments.

3. Consumer Electronics Batteries

Ultra-thin 1235 H18 foils (0.009-0.012mm) are used in smartphone, laptop, and wearable batteries, where lightweight and miniaturization are key. Soft-pack packaging foils (8079 O temper) enable slim, flexible battery designs while providing robust protection against external contaminants. The controlled surface roughness ensures secure adhesion of thin electrode layers in compact cells.

4. Sodium-Ion Batteries

As sodium-ion batteries gain commercial traction, our 1060/1235 foils are tailored for both cathode and anode current collectors (a unique advantage over lithium-ion systems). The high purity and chemical stability prevent alloying reactions with sodium, while conductive coatings optimize electron transfer in high-capacity sodium-ion cells. Each GWh of sodium-ion batteries requires 700-1000 tons of aluminum foil, making it a high-growth segment.

5. Solid-State Batteries

Compatible with next-generation solid-state batteries, our foils offer tight dimensional control and clean surfaces, critical for integrating with solid electrolytes. The smooth DSL finish ensures uniform contact with solid electrolyte layers, reducing interfacial impedance. For solid-state soft-pack designs, 8021 foils provide the necessary cold formability to seal delicate cell structures.

Handling & Fabrication Best Practices

Proper handling and fabrication are essential to preserve the performance of battery aluminium foils. Follow these industry-proven guidelines:

1. Storage & Handling

Store coils in a clean, dry environment (relative humidity ≤50%) to prevent oxidation. Use vacuum lifters or non-abrasive slings to avoid surface scratches and oil contamination-even minor scratches can cause local current concentration. Keep coils sealed in moisture-proof packaging until use, and avoid contact with corrosive substances (acids, alkalis) that damage the oxide layer.

2. Slitting & Cutting

Use high-precision slitting equipment with sharp blades to minimize burrs (burr height <5μm). Control tension during slitting to prevent stretching or deformation-critical for maintaining thickness uniformity. For H18 temper foils, avoid excessive pressure that may cause edge cracking, especially for gauges below 0.012mm.

3. Coating & Drying

For uncoated foils, ensure the surface is free of oil and contaminants before electrode coating. Maintain coating thickness uniformity to match the foil's surface roughness (0.2-0.5μm). Dry coated electrodes thoroughly to remove solvent residues, as trapped moisture can react with electrolytes and degrade battery performance.

4. Winding & Assembly

Control winding tension to avoid foil wrinkling or cracking-O temper foils require lower tension than H18. Ensure alignment during cell assembly to prevent edge misalignment, which can lead to internal short circuits. For soft-pack cells, optimize cold forming parameters to leverage the O temper foil's ductility without creating pinholes.

Our Quality Commitment & Customization Services

We understand that battery aluminium foils directly impact battery safety and performance-consistency and customization are non-negotiable. Our services include:

Strict Quality Control: Every batch undergoes thickness profiling, conductivity testing, surface cleanliness inspection, and chemical composition analysis. We provide detailed test reports (per customer request) to ensure compliance with automotive and battery standards.

Tailored Solutions: Customize alloy, gauge, temper, surface finish (SSL/DSL), and conductive coating (carbon/graphene) to match your battery design. We support small-batch trials for new battery developments and large-volume production for NEV and ESS projects.

Clean Production Environment: Our manufacturing facilities feature Class 1000 cleanrooms for post-rolling processing, minimizing dust and contamination-critical for battery-grade materials.

Global Logistics Support: Coils are packaged in moisture-proof, anti-static film with sturdy wooden pallets to protect during transit. We offer on-time delivery to global battery plants, with batch shipping options to align with your production schedule.

As the new energy sector evolves, our battery aluminium foils continue to adapt-from thinner gauges to advanced conductive coatings. Whether you're developing next-gen NEV batteries, large-scale ESS, or compact consumer electronics cells, we deliver high-precision foils that elevate battery performance. Contact us today to discuss your specifications, request samples, or get a personalized quote tailored to your battery production needs.